Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Using Square Workflow for Android & iOS
Search
Mohit S
May 18, 2022
Programming
1
400
Using Square Workflow for Android & iOS
Mohit S
May 18, 2022
Tweet
Share
More Decks by Mohit S
See All by Mohit S
Guide to Improving Compose Performance
heyitsmohit
0
210
Building Shared UIs across Platforms with Compose
heyitsmohit
1
600
Building Multiplatform Apps with Compose
heyitsmohit
2
470
Building StateFlows with Jetpack Compose
heyitsmohit
6
1.8k
Building Android Testing Infrastructure
heyitsmohit
1
440
Migrating to Kotlin State & Shared Flows
heyitsmohit
1
750
Building Android Infrastructure Teams at Scale
heyitsmohit
3
300
Strategies for Migrating to Jetpack Compose
heyitsmohit
2
540
Challenges of Building Kotlin Multiplatform Libraries
heyitsmohit
1
420
Other Decks in Programming
See All in Programming
[NG India] Event-Based State Management with NgRx SignalStore
markostanimirovic
1
160
リアルタイムレイトレーシング + ニューラルレンダリング簡単紹介 / Real-Time Ray Tracing & Neural Rendering: A Quick Introduction (2025)
shocker_0x15
1
310
AIコーディングエージェントを 「使いこなす」ための実践知と現在地 in ログラス / How to Use AI Coding Agent in Loglass
rkaga
0
130
State of Namespace
tagomoris
4
1.6k
Optimizing JRuby 10
headius
0
320
プロダクト横断分析に役立つ、事前集計しないサマリーテーブル設計
hanon52_
2
440
The Efficiency Paradox and How to Save Yourself and the World
hollycummins
0
110
Thank you <💅>, What's the Next?
ahoxa
1
160
Deoptimization: How YJIT Speeds Up Ruby by Slowing Down / RubyKaigi 2025
k0kubun
0
830
Boost Your Performance and Developer Productivity with Jakarta EE 11
ivargrimstad
0
1.6k
趣味全開のAITuber開発
kokushin
0
200
AIコーディングの理想と現実
tomohisa
22
29k
Featured
See All Featured
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
356
30k
The Power of CSS Pseudo Elements
geoffreycrofte
75
5.8k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
YesSQL, Process and Tooling at Scale
rocio
172
14k
Product Roadmaps are Hard
iamctodd
PRO
52
11k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
30
2k
Designing for humans not robots
tammielis
252
25k
KATA
mclloyd
29
14k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
47
5.3k
GraphQLとの向き合い方2022年版
quramy
46
14k
A Modern Web Designer's Workflow
chriscoyier
693
190k
Adopting Sorbet at Scale
ufuk
76
9.3k
Transcript
Mohit Sarveiya Using Square Workflow for Android & iOS @heyitsmohit
Using Square Workflow for Android & iOS • Purpose •
Building screens & setting up state • Working with Compose
Purpose • Clear boundaries between components • Immutable State •
Separation between state & UI
Workflow
Workflow (State)
Workflow (State) Actions
Workflow (State) Actions
Workflow (State) Rendering
Action UI
Action UI State
Action UI State Rendering
Action UI State Rendering
Creating Workflows • State • Actions • Screens
Square Workflow with Android Screens, Workflows & Renderings
9:41 Login Username Password
Workflow Layout Runner Screen
Setup • AndroidX View Model • View Binding
Screen • Represents view model for screen
Screen data class LoginScreen( val username: String, Val password: String,
val onLoginClicked: () -> Unit )
Layout Runner • Specifies how to update views • Supports
view binding
Layout Runner class LoginLayoutRunner( val loginViewBinding: LoginViewBinding ) : LayoutRunner<LoginScreen>
{ }
Layout Runner override fun showRendering(rendering: LoginScreen) { loginViewBinding.username.text = rendering.username
loginViewBinding.username.setTextChangedListener { rendering.onUsernameChanged(it.toString()) } loginViewBinding.login.setOnClickListener { rendering.onLoginClicked() } }
Layout Runner override fun showRendering(rendering: LoginScreen) { loginViewBinding.username.text = rendering.username
loginViewBinding.username.setTextChangedListener { rendering.onUsernameChanged(it.toString()) } loginViewBinding.login.setOnClickListener { rendering.onLoginClicked() } }
Layout Runner override fun showRendering(rendering: LoginScreen) { loginViewBinding.username.text = rendering.username
loginViewBinding.username.setTextChangedListener { rendering.onUsernameChanged(it.toString()) } loginViewBinding.login.setOnClickListener { rendering.onLoginClicked() } }
Layout Runner override fun showRendering(rendering: LoginScreen) { loginViewBinding.username.text = rendering.username
loginViewBinding.username.setTextChangedListener { rendering.onUsernameChanged(it.toString()) } loginViewBinding.login.setOnClickListener { rendering.onLoginClicked() } }
Workflow Layout Runner Screen
Workflow (State) Rendering Actions
data class State( val username: String, val password: String )
State
fun onUsernameChanged(username: String) = action { state = state.copy(username =
username) } Action
object LoginWorkflow : StatefulWorkflow<State, LoginScreen> { } Workflow
object LoginWorkflow : StatefulWorkflow<State, LoginScreen> { override fun initialState() {
} override fun render() { } } Workflow
object LoginWorkflow : StatefulWorkflow<State, LoginScreen> { override fun initialState() {
} override fun render() { } } Workflow
fun render(renderState: State) { } Workflow
fun render(renderState: State): LoginScreen { } Workflow
fun render(renderState: State): LoginScreen { LoginScreen( username = renderState.username, onUsernameChanged
= { ... }, onLoginCliked = {} ) } Workflow
fun render(renderState: State): LoginScreen { LoginScreen( username = renderState.username, onUsernameChanged
= { ... }, onLoginCliked = {} ) } Workflow
fun onUsernameChanged(username: String) = action { state = state.copy(username =
username) } Action
fun render(renderState: State): LoginScreen { LoginScreen( username = renderState.username, onUsernameChanged
= { context.actionSink.send() }, onLoginCliked = {} ) } Workflow
fun render(renderState: State): LoginScreen { LoginScreen( username = renderState.username, onUsernameChanged
= { context.actionSink.send(onUserChanged(it)) }, onLoginCliked = {} ) } Workflow
fun initialState(): State { State( username = "" ) }
Workflow
Workflow (State) Rendering Actions
View & View Model View View Model Workflow
View Model class LoginViewModel : ViewModel() { val renderings: StateFlow<LoginScreen>
by lazy { renderWorkflowIn( workflow = LoginWorkflow, scope = viewModelScope, savedStateHandle = savedState ) } }
View Model class LoginViewModel : ViewModel() { val renderings: StateFlow<LoginScreen>
by lazy { renderWorkflowIn( workflow = LoginWorkflow, scope = viewModelScope, savedStateHandle = savedState ) } }
View class LoginActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?)
{ super.onCreate(savedInstanceState) val model: LoginViewModel by viewModels() setContentView( WorkflowLayout(this).apply { start(model.renderings) } ) } }
View class LoginActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?)
{ super.onCreate(savedInstanceState) val model: LoginViewModel by viewModels() setContentView( WorkflowLayout(this).apply { start(model.renderings) } ) } }
View class LoginActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?)
{ super.onCreate(savedInstanceState) setContentView( WorkflowLayout(this).apply { start(model.renderings) } ) } }
Workflow Layout Runner Screen
9:41 Login Username Password
Action UI State Rendering
Navigation & Props
Workflow B Workflow A Props
9:41 Login Username Password
9:41 Login Username Password 9:41 Username
Todo Workflow Login Workflow Root Workflow
Root Workflow • Navigation States • Backstack
sealed class State { object Login : State() } State
sealed class State { object Login : State() data class
Todo(val username: String) : State() } State
Root Workflow object RootWorkflow : StatefulWorkflow { }
Root Workflow object RootWorkflow : StatefulWorkflow { fun render( renderProps:
Unit, renderState: State, context: RenderContext ): BackStackScreen<Any> }
Root Workflow fun render( ... ): BackStackScreen<Any> { val
backstackScreens = mutableListOf<Any>() }
Root Workflow fun render( ... ): BackStackScreen<Any> { val
loginScreen = context.renderChild(LoginWorkflow) }
Root Workflow fun render( ... ): BackStackScreen<Any> { val
loginScreen = context.renderChild(LoginWorkflow) backstackScreens += loginScreen }
Root Workflow fun render( ... ): BackStackScreen<Any> { when
(renderState) { is Todo -> { } } }
Root Workflow fun render( ... ): BackStackScreen<Any> { when
(renderState) { is Todo -> { val todoScreen = context.renderChild(TodoWorkflow) backstackScreens += todoScreen } } }
Todo Workflow Login Workflow Root Workflow
Todo List Screen data class TodoListScreen( val username: String, val
todoTitles: List<String> )
Todo Workflow State data class State( val todos: List<TodoModel> )
Todo Workflow State fun initialState() = State( listOf( TodoModel( title
= "Workout", note = "Workout" ) ) )
Todo Workflow Login Workflow Props Username
Props object TodoListWorkflow : StatefulWorkflow() { data class ListProps(val username:
String) }
Todo Workflow Login Workflow Root Workflow
Root Workflow fun render( ... ): BackStackScreen<Any> { when (renderState)
{ is Todo -> { val todoScreen = context.renderChild(TodoWorkflow) backstackScreens += todoScreen } } }
Root Workflow fun render( ... ): BackStackScreen<Any> { when (renderState)
{ is Todo -> { val todoScreen = context.renderChild( TodoWorkflow, ListProps(username = renderState.username) ) } } }
View Model View
View Model class LoginViewModel : ViewModel() { val renderings: StateFlow<LoginScreen>
by lazy { renderWorkflowIn( workflow = LoginWorkflow, scope = viewModelScope, savedStateHandle = savedState ) } }
View Model class LoginViewModel : ViewModel() { val renderings: StateFlow<LoginScreen>
by lazy { renderWorkflowIn( workflow = RootWorkflow, scope = viewModelScope, savedStateHandle = savedState ) } }
Todo Layout Runner Login Layout Runner
View Registry val viewRegistry = ViewRegistry( BackStackContainer, LoginLayoutRunner, TodoListLayoutRunner )
View Registry setContentView( WorkflowLayout(this).apply { start(model.renderings, viewRegistry) } )
Todo Workflow Login Workflow Root Workflow
9:41 Login Username Password 9:41 Username
Square Workflow with Jetpack Compose
9:41 Hello 9:41 Goodbye
Workflow Binding
Rendering data class Rendering( val message: String, val onClick: ()
-> Unit )
Binding composeScreenViewFactory<HelloWorkflow.Rendering> { rendering, _ -> Text( rendering.message, modifier =
Modifier .clickable(onClick = rendering.onClick) .fillMaxSize() .wrapContentSize(Alignment.Center) ) }
Binding composeScreenViewFactory<HelloWorkflow.Rendering> { rendering, _ -> Text( rendering.message, modifier =
Modifier .clickable(onClick = rendering.onClick) .fillMaxSize() .wrapContentSize(Alignment.Center) ) }
State enum class State { Hello, Goodbye; fun theOtherState(): State
= when (this) { Hello -> Goodbye Goodbye -> Hello } }
Action val helloAction = action { state = state.theOtherState() }
Workflow object HelloWorkflow : StatefulWorkflow { }
Workflow object HelloWorkflow : StatefulWorkflow { override fun render():
Rendering = Rendering( message = renderState.name, onClick = { context.actionSink.send(helloAction) } ) }
Action UI State Rendering
9:41 Hello 9:41 Goodbye
None
None
Thank You! www.codingwithmohit.com @heyitsmohit